RFR: 8281936: compiler/arguments/TestCodeEntryAlignment.java fails on AVX512 machines

[Jie Fu]

Hi all, 

compiler/arguments/TestCodeEntryAlignment.java fails on AVX512 machines due to stub size is not big enough.
The fix just increasing the stub size for AVX512 platforms.

Testing:
  - tier1~3 on Linux/x64 with AVX512, no regression

Thanks.
Best regards,
Jie

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Commit messages:
 - 8281936: compiler/arguments/TestCodeEntryAlignment.java fails on AVX512 machines

Changes: https://git.openjdk.java.net/jdk/pull/7485/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7485&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281936
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7485.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7485/head:pull/7485

PR: https://git.openjdk.java.net/jdk/pull/7485